Abstract: As referring to the NB/T 47013.3-2015 standard for boiler and pressure vessel and to its requirements for design and production of reference blocks for the pipe ring to the butt welded joint within the scope of the pipe and the pressure vessel, different design schemes are analyzed and compared. Design scheme of the radius curvature of reference blocks was given for wall thickness of 6 mm or higher and the curvature radius of butt welded joint being between 80 mm to 250 mm, which solved the shortage of the ultrasonic testing reference blocks for workpiece of 4 mm to 6 mm thickness and the curvature radius of typeⅡweld of the pressure equipment being greater than 80 mm. Combined with the principles of standardization, unification and practicability, the optimization scheme of this kind of test block production is given, the measurement index and reference basis of the acoustic performance similarity between the test block and the tested material are put forward, and suggestions for improvement of NB/T 47013.3-2015 are put forward for reference of relevant units in the revision of standards and practical application of engineering.